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Johannes Schlier authored Jul 10, 2017 and Wouter Wolters committed Jul 13, 2017

The 'imagefile_ext' list only contains the lowercase versions of all supported extensions.
This patch makes sure that a lowercase version of the file extension is used and it is
recognised as an image file.

Resolves: #81826
Releases: master, 8.7
Change-Id: Ice5881be4c685432987530dcdd50b1f758d883ef
Reviewed-on: https://review.typo3.org/53427

Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Tested-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>